Tobacco article



Nov. 29, 1966 s. R. ROSENTHAL 3,288,145

TOBACCO ARTICLE lOla 7 9|b ggbFiG. 9

W Am Nov. 29, E966 s. R. ROSENTHAL 3,288,145

TOBACCO ARTICLE Filed June l0, 1965 3 Sheets-Sheet 2 Hb 46 45 4|o.

Sib) 56 5in.

Nov. 29, B966 s. R. Rosr-:NTHAL 32889345 TOBACCO ARTICLE Filed June l0, 1963 5 Sheets-Sheet F5 United States Patent Gflioe Patented Nov. 29, i966 3,288,145 TQBACC() ARTICLE Sol Roy Rosenthal, 230 E. Delaware Place, Chicago, Ill. Filed June 10, 1963, Ser. No. 286,534 23 Claims. (Cl. ISI-4) This application is a continuation-in part of my copending application Ser. No. 60,159, filed Oct. 3, 1960, now abandoned.

The present invention relates to cigarettes and tobacco articles and more particularly to a highly improved smoke filtering tobacco product.

It is a well-known fact among those skilled in the tobacco arts that most of the smoke filters heretofore developed and used in the commercial manufacture of cigarettes have not been effective to remove appreciable portions of the nicotine, tars and other harmful constituents of the smoke reaching the users mouth. It has been found that artificial filters, if they are to be effective to these ends, change the taste of the smoke and also make it difficult to draw on the cigarettes, with the result that they are rejected by m-ost smokers. In order to satisfy their customers, the commercial cigarettes manufactures forthe most part have continued to use very poor artificial filters or, if a `somewhat more effective filter is employed, a heavier tobacco is used that produces more nicotine, tar and the like. The end result is the same in either case in that the smoker draws into his mouth and lungs smoke that is inadequately filtered and, in the long run, physically harmful to him.

One of the most satisfactory filters for tobacco smoke in cigarettes is the tobacco itself, but this fact has not heretofore been of practical utility in producing a safe and well filtered cigarette because of the natural tendency of most cigarette smokers to smoke each cigarette down to a relatively short butt. Medical evidence seems to indicate that the rate of lung cancer in cigarette smokers is greatest in countries where the smokers tend to smoke their cigarettes down to the lshortest butts and, if we accept the proposition that cigarette smoke produces cancer, the medical evidence would appear to be supported by laboratory tests concerning the results produced by smoking cigarettes to short butts. Actual tests have shown, for example, that the smoking of 73% of the length of an ordinary king-size cigarette, having a length of about 85 mm., will deposit in the smokers mouth about 39% to 46% more nicotine and about 35% to 46% more tars than if only 55% of the length of the cigarette is smoked. rIhis startling increase in the amount of nicotine .and tar consumed is thus experienced in reducing the butt length a mere 18% of the cigarettes original length. These figures will of course vary, depending upon the brand of cigarettes being tested and upon the nature of the tobacco used therein, but they clearly show the importance of the relationship between the length of the butt and the amount of nicotine and tars to which the smoker is subjected. The tobacco toward the butt end of the cigarette serves effectively to filter the smoke during the early burning of the cigarette, at which time the nicotine and tars are deposited on the particles of tobacco adjacent to the butt end. However, as the butt becomes shorter, the previously deposited nicotine and tars are again thrown into the mainstream of smoke, with the esult that the sm-oker is then subjected to smoke that contains a very high and progressively increasing percentage of tars, nicotine and other undesirable smoke ingredients.

One of the objects of the present invention is to provide a highly improved and yet inexpensive and easily manufactured cigarette that safely and effectively employs the tobacco as a filter and prevents reintroduction into the mainstream of smoke the nicotine and tars and the like that are deposited upon the tobacco adjacent the butt end of the cigarette. This objective is fulfilled in the present invention by providing a cigarette containing two columns of tobacco in end-to-end position with a fire-stop for preventing the burning from spreading from one column to the other during the act of smoking. The unlighted column of tobacco is thus protected from ignition and is maintained at its full length as a filter for the smoke produced by the other column, none of the tars an-d nicotine and the like deposited upon the tobacco of the filtering column being reintroduced into the mainstream ofthe smoke.

Another object of the present invention is to provide a cigarette of the above character which may if desired, be smoked from either end.

Yet another object of the invention is to provide a cigarette of the kind stated above wherein the fire-stop means is comprised of fire resistant ion exchange material for absorbing ionized particles from the smoke.

Still another object is to provide a cigarette or other tobacco article wherein the tobacco is effectively employed as a filter for the smoke.

These and other objects and advantages of the present invention will be apparent from the following description, taken with the accompanying drawings, wherein:

FIGURE l is an elevational view of a cigarette constructed in accordance with and embodying therein the principles of the present invention;

FIG. 2 is a greatly enlarged longitudinal sectional view of the intermediate portion of the cigarette shown in FIG. 1;

FIG. 3 is a view in lateral cross section through the cigarette of FIG. 2 along the line 3-3 thereof;

FIG. 4 is another enlarged longitudinal sectional view of the intermediate portion of a cigarette that is a modiication of the one illustrated -in FIGS. l to 3;

FIG. 5 is another enlarged longitudinal sectional view of the intermediate portion of a cigarette showing still another variation;

FIG. 6 is a similar view showing yet another variation;

FIG. 7 is an enlarged longitudinal sectional view of the intermediate portion of a cigarette made in accordance with the present invention and employing a cup of metal foil as the fire barrier therein;

FIG. 8 is an enlarged longitudinal sectional View of a cigarette similar to FIG. 7, but illustrating the use of two oppositely facing metal foil cups with a barrier therebetween as fire barriers;

FIG. 9 is an enlarged longitudinal sectional view of a modified form of the cigarette shown in FIG. 7;

FIG. 10 is another enlarged longitudinal sectional View showing a modified form of the cigarettes of FIGS. 8 and 9;

FIG. 1l is an enlarged longitudinal sectional view of the intermediate portion of yet another embodiment of the cigarette to the present invention wherein a capsule is disposed within the cigarette to serve as the vfire barrier;

FIG. 12 is another enlarged longitudinal sectional view of a modification of the cigarette illustrated in FIG. 1l;

FIG. 13 is a similar enlarged sectional View of the modification of the cigarette illustrated in FIGS. ll and 12;

FIG. 14 isa schematic and diagrammatic illustration of the method of forming the cigarettes of FIGS. l to 4 in accordance with the present invention;

FIG. 15 is a schematic and diagrammatic illustration of the method of forming the cigarette of FIG. 5 of the present invention;

FIG. 16 is a schematic and diagrammatic illustration of yet another method of making the cigarettes of FIGS. l to 4 in accordance with the present invention;

FIG. 17 is a schematic and diagrammatic illustration of the method of making the cigarette of FIG. 9 of the present invention; and

FIG. 18 is a schematic and diagrammatic illustration of the method of forming the cigarette of FIG. 12 of the present invention.

Referring now to the drawings, and particularly to FIGS. 1 to 3 thereof, the numeral 20 therein designates a cigarette constructed in accordance with the present invention, the cigarette 20 preferably being the normal length and including the usual outer paper Wrapper 21 which is divided into a right-hand section 21a and a lefthand section 2lb (see FIG. 2). Withinthe wrapper 21 there are two columns 22 and 23 of smoking tobacco disposed in end-to-end position, the tobacco column 22 more particularly being within the wrapper section 21a and the tobacco column 23 being more particularly within the wrapper section 2lb. Intermediate the two columns of tobacco there is provided a non-inflammable fire barrier generally designated by the numeral 24 and comprising an outer longitudinally extending and cylindrical re barrier 25 and an ,inner lateral re barrier l26, the re barriers 25 and 26 being formed of metal foil and cooperating to form cup-like receptacles for the associated ends of the wrapper sections 21a and 2lb and the associated tobacco columns 22 and 23, respectively.

The longitudinal fire barrier 25 contacts the outer suri face of the Wrapper sections 21a and 2lb completely around the periphery of the adjacent ends thereof and more particularly extends therealong for a distance of at least about 4 mm., it having been foundin accordance with the present invention thatthis longitudinal extentV of the re barrier 25 will positively stop burning of the wrapper 21 during drawing upon the lighted cigarette 20, particularly in combination with the lateral fire barrier 26. The inner surface of the longitudinal re barrier 25 has a layer of adhesive material thereon which adhesively secures the barrier 25 to the adjacent ends of the wrapper sections 21a and 2lb to hold the various parts assembled and thus to form the cigarette 20. The longitudinal re barrier 25 may also have the outer surface thereof colored or otherwise decorated to impart a distinctive appearance to the completed cigarette 20.

The lateral fire barrier 26 is generally circular in shape and contacts the linner surface of the longitudinal fire barrier 25 completely around the periphery thereof so as positively to provide a barrier between the wrapper sections 21a and 2lb and also to provide a barrier between the tobacco columns 22 and 23. In order to permit the smoker to draw in the usual manner through the cigarette 20, the lateral fire barrier 26 is provided with a plurality of holes 27 therein, see particularly FIG. 3, it having been found that the aggregate total of the cross-sectional area of the holes 27 should be between about 0.90 and 1.13% of the cross-sectional area of the cigarette 20 in order not to interfere with normal drawing therethrough.

In a typical example of the cigarette 20, the diameter thereof is about 7.5 mm. and the length thereof is about 70 mm. for a regular size cigarette and about 85 mm. for a king size cigarette. When the cigarette has such dimensions, the metal foil from which the fire barrier 24 is formed preferably has a thickness from about 0.02 mm. to about 0.03 mm., the preferred metal foil being aluminum metal foil having the required thickness. As mentioned above, the longitudinal extent of the longitudinal re barrier 25 must be at least about 4 mm. positively to stop the burning of the associated cigarette while drawing therethrough, and the longitudinal extent of the ire barrier 25 may be as much as 6 mm. It has been found that if the longitudinal extent of the longitudinal fire barrier 25 is less than about 4 mm., re will be propagated along and between the wrapper sections 21a and 2lb and will be transferred between the tobacco columns 22 and of the wrapper sections 21a and 2lb and the associated tobacco columns 22 and 23, respectively.

When the parts have the dimensions described herein, the lateral re barrier 26 preferably has from about 8 to about 10 of the holes 27 therein, 9 of the holes 27 being illustrated in FIG. 3 of the drawings. To insure stopping of the fire at the barrier 24, the holes 27 must be positioned at least about 1 mm. from the adjacent surface of the wrapper 21 and must fall within the circle indicated by the dashed line 28 in FIG. 3 so as to leave a zone about 1 mm. wide between the line 28 and the wrapper 21 that is free of holes. The holes 27 should also be positioned apart at least about 1 mm. It has been found that the holes 27 must have a size of less than about 0.6 mm. to prevent the transfer of fire between the tobacco columns 22 and 23 during drawing on the cigarette. The preferred size of the holes 27 is from about 0.225 mm. to about 0.275 mm. and the holes 27 preferably represent an aggregate cross-sectional area of from about 0.4 to about 0.5 mm?, thereby insuring against transfer of fire through the openings and, at the same time, maintaining the normal draw characteristics of the cigarette. -If the number of holes 27 in the barrier 26 is substantially fewer than S, the size of each of the holes 27 must be so large, if normal drawing is to be maintained, that fire will tend to be transmitted therethrough between the tobacco columns 22 and 23 during drawing. The lsizes of the individual holes set forth above and the spacing therebetween and the aggregate cross-sectional area thereof are important in insuring a free and natural draw to the cigarette 20 while providing an effective re stop to prevent the transfer of lire between the tobacco columns 22 and 23. The

' sizes of the holes 27, however may be decreased if their number is correspondingly increased so as to maintain the free and.natural draw characteristics of the cigarette. For example, the size of the holes 27 may be decreased to as small as about 0.112 mm. to 0.137 mm., provided the number of holes is increased to about 32 to 40, but the use of such small openings in such large number involves manufacturing problems in the production of the barrier 26 which, at this time, make it preferable to use fewer holes of the preferred size and number referred to above.

Either end of the cigarette 20 illustrated in FIGS. 1 to 3 may be lighted, and the cigarette may be smoked in the usual fashion. The tobacco columns 22 and 23 are packed with the usual compactness, and the holes 27 in the lateral re barrier 26 when constructed as described above will avoid any substantial obstruction to the draw of the cigarette 20. If it is assumed, for example, that the right-hand end of the cigarette 20 is lighted by the user, the tobacco column 22 will be :smoked in the usual fashion by the user, with the smoke produced by the burning of the tobacco column 22 passing through the openings 27 in the lateral tire barrier 26 and through the entire tobacco column 23 before it reaches the mouth of the user. In passing through the tobacco column 23 the smoke is adequately filtered by the strands of tobacco therein, the tars and nicotine and other harmful ingredients from the smoke adhering to or being absorbed in the strands of tobacco. When the fire in the tobacco column 22 reaches the fire barrier 24 and when the supply of tobacco in the column 22 has been substantially exhausted, the re will automatically be extinguished by the re barrier 24, with the result that the tobacco column 23 will not be ignited and the tars and nicotine and other harmful materials previously deposited thereon from the smoke of the tobacco column 22 will never be released or reintroduced into the mainstream of the smoke lfor consumption by the user. The tobacco column 23, by virtue of the fire barrier 24, is thus maintained as an ideal and effective filter for the cigarette without adversely affecting the draw of the cigarette, without changing the taste thereof, and without permitting harmful amounts of nicotine and tar and the like to reach the smokers mouth.

There is illustrated in FIG. 4 of the drawings a modification of the cigarette illustrated in FIGS. l to 3, the cigarette of FIG. 4 being generally designated by the numeral 40, the corresponding parts of the cigarette 40 being numbered in a like manner as the corresponding parts of the cigarette 20. There is added to the cigarette 40 a third tubular wrapper 49 which is formed of paper and extends around the longitudinal fire barrier 45 and beyond the ends thereof and has a first portion 49a in contact with and secured to the wrapper section 41a and a second portion 49b in contact with the secured to the wrapper section 41h. The fire barrier 44 serves to stop the fire when the cigarette 40 is lighted from-either end despite the presence of the third wrapper or overwrap 49. Preferably the inner surface of the wrapper 49 has an adhesive layer thereon for securing the portions 49a and 49h to the wrapper sections 41a and 4111, respectively. The wrapper 49 may also have the outer surface thereof colored, metallized, or the like to impart a distinctive appearance to the cigarette 40.

The cigarette 50 illustrated in FIG. 5 is similar to the cigarette 40 illustrated in FIG. 4 but differs therefrom in that the longitudinal fire barrier 55 contacts the lateral fire barrier 56 at one end thereof and extends therefrom at least about 4 mm. along only the wrapper section 51a and is preferably adhesively secured thereto. The tubular wrapper 59 contacts only the longitudinal fire barrier 55 and the Wrapper section 51b and is adhesively secured thereto to interconnect the wrapper sections 51a and 51b and the associated tobacco columns 52 and 53 respectively.

There is illustrated inFIG. 6 of the drawings yet another cigarette 60 which is a modification of the cigarette 20 illustrated in FIGS. 1 to 3. In the cigarette 60, the tubular wrapper 61 is preferably made in a single section rather than two sections and the longitudinal fire barrier 65 is disposed Within the wrapper 61 rather than exterioraly thereof as is the case in the cigarette 20 wherein the longitudinal fire barrier is disposed exteriorly of the wrapper sections 21a and 2lb. In all other respects the cigarette 60 of FIG. 6 isconstructed like the cigarette 2t) of FIG. 2 and has the various critical dimensions set forth above with respect to the cigarette 20.

There are illustrated in FIGS. 7 to l0 of the drawings four different cigarettes embodying the principles of the present invention but constructed in a manner `such that the longitudinal fire barrier and the lateral fire barrier are integral to form a cup for the adjacent end of the associated tobacco column. More particularly, the cigarette 70 of FIG. 7 includes a paper wrapper 71 containing two tobacco columns 72 -and 73 disposed in end-toend relationship, a fire barrier generally designated by the numeral 74 being disposed intermediate the tobacco columns. The re barrier 74 is cup-shaped and is preferably formed of aluminum foil and includes a substantially cylindrical side wall 75 and an integral diaphragm or lateral wall 76 interposed between the two tobacco columns 72 and 73. The outer surface of the cylindrical wall 75 is in contact with `the inner surface of the wrapper 71 around the entire periphery thereof for a longitudinal extent of at least about 4 mm. and up to about 6 mm. The lateral wall 76 is provided with a plurality of holes 77 therein, the construction and arrangement of the wall 76 and the holes 77 being like that of and having the dimensions of the lateral fire barrier 26 and the holes 27 described above with respect to FIGS. 1 to 3. The cup 74 completely surrounds and receives therein the adjacent end of the tobacco column 72 and is effective positively to stop the burning of the wrapper 71 and to prevent transfer of fire between the tobacco columns 72 and 73 even during drawing thereon and regardless of which endof the cigarette 70 is lighted.

There is illustrated in FIG. 8 a further modification of the cigarette of the present invention, wherein a tobacco column 82 is separated from a tobacco column 83 by two fire barriers 84a and 84b which are in all respects like the `fire barrier 74 described above and illustrated in FIG. 7. The lateral fire barriers 86a and S617 are spaced-apart and the space therebetween is filled with tobacco packed in the usual manner and substantially centrally thereof is a third fire barrier 86C having holes 87C therein, the lire barrier 86C and the holes 87C being positioned and having dimensions within the ranges discussed above when describing the lateral fire barrier 26 and the holes 27 of the cigarette 20. Thus, when the tobacco column 82 is lighted, the smoke therefrom must not only pass through the tobacco column 83 to be filtered as described above, but the smoke also cornes into contact with the several lateral barriers 86a, 86b and 86C which will tend to cool the smoke and to condense thereon certain undesirable constituents of the smoke. The fire barriers presented will also effectively extinguish the fire in the tobacco column 82 when the supply of tobacco therein becomes substantially exhausted and will positively prevent the iire from spreading to the tobacco column 83, even though there is normal drawing thereon, thereby preventing burning of the latter tobacco column and preventing the residues absorbed thereby and -condensed upon the barriers 86a., 86b and 86e from being .reintroduced into the smoke that would reach the users mouth. Conversely, if the outer end of the tobacco column 83 is lighted, the tobacco column 82 will be maintained as a filtering agent for the smoke and the various fire barriers will stop the burning of the tobacco and the wrapper 81 in the same manner as described above when the tobacco column 82 is lighted.

There is shown in FIG. 9 of the drawings a modification of the cigarette illustrated in FIG. 7, the cigarette 90 of FIG. 9 including a tubular wrapper having a pair of spaced-apart wrapper sections 91a and 91h within which are disposed tobacco columns 92 and 93, respectively. The left-hand end of the tobacco column 92 and the associated wrapper 91a are shown disposed within a cup generally designated by the numeral 94 and constructed like the cup 74 of FIG. 7 and having the same critical dimensions of the cylindrical wall 95, the lateral wall 96, and the holes 97 thereof as the like parts in the cup 74 of FIG. 7. The tobacco columns 92 and 93 rejoined by a third tubular wrapper or overwrap 99 which extends around the cup 94 and particularly the cylindrical wall thereof and has one end portion 99a in contact with and adhesively secured to the adjacent end of the wrapper 91a around the circumference thereof and an end portion 99b in contact with and adhesively secured to the adjacent end of the wrapper 91h around the circumference thereof. The cigarette 90 can be smoked from either end and the cup barrier 94 will positively stop burning of the wrappers 91u, 91band 99 and prevent transfer of fire between the tobacco columns 92 and 93, even during drawing therethrough, and regardless of which end of the cigarette 90 is lighted. Accordingly, at least one of the cigarette columns 92 or 93 will be preserved as a filter for the burning of the other tobacco column as has been explained above.

A modification of Ithe cigarette of FIG. 9 is illustrated in FIG. l0 of the drawings and is generally designated by the numeral 100. The cigarette 16) differs from the cigarette 90 by employing a first cup barrier 1ii4a to surround and receive the adjacent end of the tobacco column 102 and its associated wrapper 10M and a second cup barrier 104i; to receive and to surround the adjacent end of the tobacco Column 103 and its associated wrapper 1Mb. The cup barriers Milt-iz and 1Mb are in all respects constructed and arranged alike and like the cup barrier 94 of FIG. 9, it being understood that the holes 107a and 107i: therein must be in general alignment so as not to interfere with normal drawing through the cigarette 100. The two tobacco columns 102 and 103 are connected by a third tubular wrapper or overwrap 109 which contacts and surrounds both of the cup barriers 104a and 104b and has a first end portion 10% overlying and adhesively secured to the outer surface of the adjacent end of the wrapper 101:1 around the entire periphery thereof and a second end portion 10911 overlying and adhesively secured to the outer surface of the adjacent end of the wrapper 101b around the entire periphery thereof. The cigarette construction of FIG. 10 possesses all of the advantages pointed out above with respect to the cigarette construction of FIG. 9 and more specifically it positively prevents burning of the wrappers past the cup barriers 10451 and 104b and positively prevents the transfer of fire between the tobacco columns 102 and 103, even during drawing upon the cigarette 100 and regardless of which end the cigarette 100 is lighted and smoked.

Tests have indicated that a great variety of complex chemical substances are contained in tobacco smoke, including nicotines, tars and certain vapor phase constituents. Among these vapor phase constituents are aldehydes and ketones which are considered by some investigators to be those that are the most irritating and harmful to the smoker if they reach his mouth or lungs. These aldehydes and ketones may be unionized or in an ionized or partially ionized form as they pass through the cigaret-te. Accordingly, a layer of granular or comminuted filtering porous material such as a molecular sieve type resin, or an ion exchange resin, or an ion retardation resin or an ion exclusion resin, or combinations thereof, may be profitably included in the cigarette of the present invention. These resin materials are well known and they are fire resistant so -that they provide an ideal material for a fire barrier. Resin materials, such as those produced by The Dow Chemical Company, Midland, Michigan, under the trademark Dowex, are readily available on the market and are excellent for this purpose. In addition to limiting the burning of the cigarette to one of the tobacco columns and thus maintaining the other tobacco column as an effective filter for the solids contained in the tobacco smoke, they also absorb by ion exchange action, or by retardation or exclusion as the case may be, the harmful aldehydes and ketones contained in the vapor phase of the smoke produced by the burning of the tobacco column.

' There are illustrated in FIGS. ll, 12 and 13 of the drawings cigarettes made in accordance with the present invention incorporating therein as a part of the fire barrier an additional filtering material which may be tobacco or one of the resin materials discussed in the preceding paragraph. Referring first to FIG. 11, the cigarette 110 thereof includes the usual paper wrapper 111 containing tobacco columns 112 or 113 between which is disposed a capsule generally designated by the numeral 114 and including a cylindrical side wall 115 in contact with the inner surface of the wrapper-111 completely around the circumference thereof for a longitudinal distance of at least about 4 mm., and a pair of lateral Walls 116a and 116b having holes 117a and 117b therein. The walls 116a and 116i) respectively close the opposite ends of the cylindrical wall 115 to provide the capsule 114 wi-thin which is disposed the filtering material generally designated by the numeral 118. The walls 115, 116a and 116b are preferably formed of metal foil, such as aluminum foil, and the capsule 114 is filled or substantially filled with any suitable filtering material 118 which may include any of the materials listed above. The construction and arrangement of the lateral Walls 116:1 and 116]) and the respective holes 11'7a and 117b are like and have dimensions like the la-teral barrier 26 and the holes 27 discussed above with respect to the cigarette 20. The cigarette 110 can be -lighted from either end, the unlighted tobacco column serving as an effective filter for the smoke produced by the burning of the lighted tobacco column Without adversely affecting the taste or the draw of the cigarette, and the unlighted tobacco column is maintained as a filter by the fact -that the capsule 114 prevents the spread of fire from the lighted tobacco column to the filtering tobacco column or along the tubular Wrapper 111 past the cylindrical wall 115. Furthermore, the material 118 contained in the capsule 114 has fil-tering properties, as previously indicated, and when the material 118 includes one or more of the various resins referred to above, it effectively absorbs the harmful organic ingredients including aldehydes, ketones, and the like contained in the vapor phase of the smoke.

The cigarette 120 illustrated in FIG. l2 of the drawings is a modification of the cigarette 110 of FIG. l1 and includes a pair of wrapper sections 121a and 121b filled respectively with tobacco columns 122 and 123. Disposed between the adjacent ends of the tobacco columns 122 and 123 is a capsule 124 substantially identical in all respects to the capsule 114 described above, except that the outer diameter of the cylindrical wall is substantially equal to the outer diameter of the wrapper sections 121a and 121b. The tobacco columns 122 and 123 and the capsule 124 are all connected together by a third tubular wrapper or overwrap 129 which contacts the cylindrical wall 125 completely around the periphery thereof and has a first end portion 129a in contact with and adhesively secured to the adjacent end of the wrapper 121a around the entire periphery thereof and a second end 129b in contact with and adhesively secured to the adjacent end of the wrapper 121b around the entire periphery thereof. The cigarette 120 of FIG. l2 has all of the desirable proper-ties of the cigarette 110 of FIG. 11 and more specifically, can be smoked from either end and yet will not transfer fire between the tobacco columns 122 and 123 or along the wrappers 121a, 121b and 129 even when drawing thereon, whereby to preserve one 4of the tobacco columns as a filter for the smoke produced by burning the other, the capsule 124 providing additional filtering and absorption.

FIG. 13 illustrates a modified form of the cigarette shown in FIG. l1, and more specifically, shows a modied form of the capsule. The capsule 134 of the cigarette in FIG. 13 includes a first Outer cylindrical wall 135a having the right-hand end closed by a lateral wall 136a having holes 1376: therein, the wall 135a telescopically receiving therein a second cylindrical wall 135b which has the left-hand end thereof closed by a lateral wall 136b having holes 137b therein. Also disposed within the capsule 134 is a lateral wall 136e having a plurality of holes 137C therein dividing the capsule into two compartments, the right-hand compartment being preferably filled with a first filtering material 133:1 and the left-hand compartment being preferably filled by a second ltering material 138i).y The filtering materials 138a and 138]; may be either the same or a different filtering material or mixture of filtering materials. Each of the lateral walls 136a, 136b and 136e has an arrangement of the holes therein like the lateral fire barrier 26 discussed above and the filtering materials 138a and 138b are a porous mass so as substantially not to interfere with the normal draw through the cigarette 130.

Turning now to FIG. 14 of the drawings, the method of forming the cigarettes of FIGS. 1 to 4 will be described and as is diagramma-tically illustrated in FIG. 14A, there first are provided the tubular wrapper sections 41a and 41b filled respectively with the tobacco columns 42 and 43 and arranged substantially in axial alignment with the adjacent ends spaced apart and receiving therebetween the lateral fire barrier 46. The wrapper sections 41a and 41b are then moved axially toward each other and toward the fire barrier 46, as in FIG. 14B after which the longitudinal fire barrier 45 is wrapped around the junctions between the lateral fire barrier 46 and the tubular Wrapper-sections 41a and 4112 as illustrated in the step of FIG. 14C. If the inner surface of the metal foil forming the longitudinal fire barrier 45 is provided with an adhesive coating, it will be understood that the foil 45 will suitably interconnect the par-ts to form a cigarette like the cigarette Ztl of FIGS. 1 to 3. If no adhesive layer is provided on the inner surface of the metal foil 45 or if it is desired to provide a paper overwrap therearound, the third tubular wrapper 49 is provided about the longitudinal re barrier 45 andthe outer ends 49a and 49b thereof are wrapped around and preferably adhesively secured to the outer surface of the adjacent ends of the tubular wrappers 41a and 41h, respectively, whereby to form the completed cigarette 49 of FIG. 4.

The method of making the cigarette 5f) of FIG. 5 is illustrated in FIG. of the drawings, this method being a variation of the method illustrated in FIG. 14 of the drawings and described above. There first are provided in general longitudinal alignment the tubular wrapper sections 51a and 5111 filled with the tobacco columns 52 and 53, respectively, the adjacent ends of the wrapper sections 51a and 51h being spaced apart to receive therebetween and in general alignment the lateral fire barrier 56 as illustrated in the step of FIG. 15A. As illustrated in the step of FIG. 15B, the wrapper sections 51a and SIb are moved longitudinally toward each other and against the opposite sides of the lateral fire barrier 56 after which the metal foil band to form the longitudinal fire barrier 55 is wrapped about the assembly and positioned to overlie the periphery of the lateral fire barrier 56 and the adjacent end of the wrapper section 51a, see FIG. 15C. In order to secure the various parts in the assembled positions, the tubular Wrapper or overwrap 59 is applied about the band 55 and with one end 59a con- -tacting and adhesively secured to the adjacent end of the wrapper section 51a around the entire periphery thereof and the other section 5% placed in contact with and adhesively secured to 4the adjacent end of the wrapper section Sib around the entire periphery thereof, -thus to form the completed cigarette 50 of FIG. 5, see FIG. 15D.

A modified method of making the cigarette 40 of FIG. 4 is illustrated in FIG. 16 of the drawings, this method being adapted :to produce a plurality of the cigarettes 4t) substantially simultaneously. There first are provi-fled in general longitudinal alignment in FIG. 16A from right to left a tubular wrapper section 41a filled with a column of tobacco and having a length equal substantially to onehalf the length of the finished cigarette 40; a lateral fire barrier 46a like the fire barrier 46 described above with respect to FIG. 4; a tubular wrapper section 47e having a tobaco column therein and having a length equal substantially to the length of the finished cigarette 49, ie., substantially to twice the length of the tubular wrapper section 41a; a lateral fire barrier 4Gb identical to the lateral fire barrier 46a; a tubular wrapper section 411 filled with a tobacco column and having a length equal substantially to the length of the finished cigarette 4t2, i.e., about twice the length of the Wrapper section 41a; a lateral fire barrier 46c identical in construction to the fire barriers 46a and 46]); and a tubular wrapper section 41h filled with a tobacco column and having a length substantially equal to that of the wrapper section 41a, i.e., about onehalf the length of a finished cigarette 4d. In the next step of the method illustrated in FIG. 16B, the parts of FIG. 16A are moved inwardly toward the center to place the adjacent ends of the various wrapper Sections in contact with the adjacent surfaces of the various lateral fire barriers 46a, 46h and 46c. Thereafter, as illustrated in FIG. 16C, there is applied about each of the lateral fire barriers 46a, 46b and 46c a band of metal foil forming the longitudinal fire barriers 45a, 45h and 45C, respectively, the ends of the longitudinal fire barriers 415:1, 451) and 45C extending over and covering and being in contact with the adjacent ends of the adjacent wrapper sections around the entire periphery thereof. Next the third tubular wrappers 49a, @9d and 49g are applied about the longitudinal fire barriers 45a, 45h and 45C, respectively,

l@ and are adhesively secured to the adjacent ends of the adjacent tubular sections to form a singie continuous cigarette assembly as illustrated in FIG. 16D, the assembly of FIG. 16D having a length equal substantially to that of three of the cigarettes 40. Finally, the cigarette assembly of FIG. 16D is cut or severed at two points along the lines 161 and 162 to form three of the cigarettes 4). More specifically, the tubular section 41a and a subular section 41d corresponding to the right-hand half of the tubular section 41e are held against the lateral fire barrier 46a with the longitudinal lire barrier 45a therearound by the third tubular wrapper 49a to form a first cigarette 40; a wrapper section 49d being the left-hand half of the wrapper section 41C is joined to a wrapper section 41g being the righthand end of the wrapper section 417c with the lateral fire barrier 46b therebetween and the longitudinal fire barrier 4512 therearound and held together by the third tubular Wrapper 49d to form the second or middle cigarette 4f); and the wrapper section 41h being the left-hand half of the wrapper section 411 is joined to the Wrapper section 41b with the lateral fire barrier 46c therebetween and the longitudinal fire barrier 45e therearound and held together by the third tubular Wrapper 49g to form the third or lefthand cigarette 40 in FIG. 16E.

As a modification of the method illustrated in FIG. 16 of the drawings, if the longitudinal fire barriers 45a, 45b and 45C in FIG. 16C are provided with adhesive on the surface thereof disposed toward the various wrapper sections, these longitudinal fire barriers can secure together the various wrapper sections and upon cutting the Wrapper sections 41C and 41] at the midpoints thereof, three of the cigarettes 20 of FIGS. 1 to 3 can be formed therefrom. It further is pointed `out that the method of FIG. 16 and the modification thereof set forth above can be further modified by providing additional tubular wrapper sections like the wrapper section 41e or 41f Wtih additional lateral fire barriers 46 to extend the length of the cigarette assernbly to any desired extent to achieve further economies in the manufacture of the cigarettes 40 or the cigarettes 20 as the case may be.

The method of making the cigarette of FIG. 9 is illustrated in FIG. 17 of the drawings. There first are provided in Igeneral longitudinal alignment the tubular Wrapper sections 91a and 91b filled with the tobacco columns 92 and 93, respectively, the adjacent ends of the wrapper sections 91a and 9112 being spaced-apart to receive therebetween a sheet 94a of metal foil. The metal foil sheet 94a has centrally thereof a plurality of holes shaped and arranged like the holes 97 in FIG. 9 and the remainder of the sheet is imperforate. The area of the holes 97 and the adjacent end of the wrapper section 91a ,are moved together as in FIG. 17B with the area of the holes 97 disposed centrally yof the wrapper section 91a and the outer portions of the sheet 94a are folded around the adjacent end of the tubular section 91a to form the longitudinal fire'barrier 95 and the lateral fire barrier 96 upon the adjacent end of the Wrapper Section 91a. The adjacent end of the wrapper section 91h is then moved against the adjacent surface of the lateral fire barrier 96 as in FIG. 17C, after which the third tubular wrapper 99 is applied about the wrapper section 91a and 91b in contact with the adjacent ends thereof and adhesively secured thereto about the entire periphery thereof, thus forming lthe completed cigarette 90;

As a first modification of the method illustrated in FIG. 17 of the drawings, a pre-formed cup 94 including the longitudinal cylindrical Wall and the lateral Wall 96 with the holes 97 therein may be used in place of the metal foil sheet 94a illustrated. In forming the cigarette using the pre-formed cup, the adjacent end of the wrapper section 91a is inserted therein after which the third Wrapper 99 is disposed thereabout to form a completed cigarette 90. The method illustrated in FIG. 17 can be further modified to apply a cup to both of the adjacent ends of the wrapper sections, either by using two of the metal foil sheets 94a or by using two pre-formed cups 94. After the application of the cups 94 to the adjacent ends of the wrapper sections 91a and 91h, the third wrapper 99 is applied thereabout to form a completed cigarette, the cigarette having the form illustrated in FIG. of the drawings, namely, the cigarette 100 thereof.

Referring to FIG. 18 of the drawings, the method of forming the cigarette of FIG. 12 will be described. There rst are provided the tubular wrapper sections 121a and 121b filled respectively with the tobacco columns 122 and 123 and arranged substantially in axial alignment with the adjacent ends spaced apart and receiving therebetween the capsule 124, all as is illustrated in FIG. 18A. The wrapper sections 121a and 121b are then moved axially toward each other and toward the capsule 124 as in FIG. 18B, after which the third wrapper 129 is wrapped around the junctures between the capsule 124 and the wrapper sections 121a and 121b as illustrated in FIG. 18C. The inner surface of the wrapper 129 has an adhesive layer thereon which serves securely to adhere the adjacent ends of the wrapper 129 to the outer surface of the adjacent ends of the wrapper sections 121a and 12117, respectively.

The foregoing description of certain preferred embodiments of the cigarettes of the present invention and the methods of making 4the same has been given for clarity of understanding only, and no unnecessary limitations are intended thereby, for it will be apparent to those skilled in the art that numerous additional Variations, changes and modifications may be made `in the cigarettes of the present invention and the method of making the same without departing from the true spirit and scope of the appended claims.

What is claimed is:

1. A cigarette `comprising a longitudinally extending tubular wrapper, two columns of tobacco in end-to-end position within said wrapper, a lateral lire vbarrier of metal foil between the adjacent ends of said two columns of tobacco, and a longitudinal iire barrier of metal foil extending from said lateral fire barrier and in thermal contact with said wrapper around the entire periphery thereof, said cigarette being adapted to be smoked from either end with one of said columns of tobacco serving as a lter for the smoke produced by the burning of the other column of tobacco, said lateral fire barrier being porous so as to present substantially no resistance to drawing therethrough during the smoking of said other column of tobacco, said longitudinal fire barrier being cylindrical and extending at least about 4 mm. longitudinally of said wrapper and around the entire periphery thereof, said lire barriers cooperating positively to stop burning of said wrapper and said other column of tobacco even during drawing therethrough when said other column of tobacco is substantially consumed.

2. The cigarette set forth in claim 1, wherein said lateral re barrier and said longitudinal iire barrier are in contact with each other around the entire periphery of said lateral re barrier.

3. The cigarette set forth in claim 1, wherein said lateral fire barrier and said longitudinal lire barrier are integral around the entire periphery of said lateral re barrier.

4. A cigarette comprising a longitudinally extending tubular wrapper, two columns of tobacco in end-toend position within said wrapper, alateral lire barrier of metal foil between the adjacent ends of said two columns of tobacco, and a longitudinal fire barrier of metal foil extending from said lateral fire barrier and in thermal contact with said wrapper around the entire periphery thereof, said cigarette being adapted to be smoked from either end with one of said columns of tobacco serving as a filter for the smoke produced by the burning of the other column of tobacco, said lateral fire barrier having a plurality of holes therein having an area equal to from about 0.90% to about 1.13% of the crosssectional area of said tubular wrapper so as to present substantially no resistance to drawing therethrough during the smoking of said other column of tobacco, said longitudinal re barrier being cylindrical and extending at least about 4 mm. longitudinally of said wrapper and around the entire periphery thereof, said re barriers cooperating positively to stop burning of said wrapper and said other column of tobacco even during drawing therethrough when said other column of tobacco is substantially consumed.

5. A cigarette comprising a longitudinally extending tubular wrapper, two columns of tobacco in end-to-end position within said wrapper, a lateral fire barrier of metal foil between the adjacent ends of said two columns of tobacco, and a longitudinal fire barrier of metal foil extending from said lateral re barrier and in thermal contact with said wrapper around the entire periphery thereof, said cigarette being adapted to be smoked from either end with one of said columns of tobacco serving as a lter for the smoke produced by the burning of the other column of tobacco, said lateral fire barrier having a plurality of holes therein all spaced at least about 1 mm. from the periphery thereof and spaced from each other at least about 1 mm. and having a total area aggregating from about 0.90% to about 1.13% of the total cross-sectional area of said wrapper so as to present substantially no resistance to drawing therethrough during the smoking of said other column of tobacco, said longitudinal re barrier being cylindrical and extending at least about 4 mm. longitudinally of said wrapper and around the entire periphery thereof, said fire barriers cooperating positively to stop burning of said wrapper and said other column of tobacco even during drawing therethrough when said other column of tobacco is substantially consumed.

6. The cigarette set forth in claim 5, wherein said tubular wrapper has a diameter of about 7.5 mm., and said lateral fire barrier has from about 8 to about 10 holes therein each having a diameter in the range from about 0.225-mm. to about 0.275 mm., the aggregate crosssectional area of said holes being from about 0.4 to about 0.5 mm2.

7. A cigarette comprising a longitudinally extending tubular wrapper, two columns of tobacco in end-toend position within said wrapper, a lateral lire barnier of metal foil between the adjacent ends of said two columns of tobacco, and a longitudinal lire barrier of metal ffoil extending from said lateral ire barrier and :in thermal contact with said wrapper around the entire peniphery thereof, said cigarette being adapted to be smoked .from either end with one of said columns of tobacco s-erving as a ilter for the smoke produced by the burning of the other oolfunm of tobacco, said lateral fire barrier being Iporous so as to present substantially no resistance to drawing therethrough during the smoking -of said other column of tobacco, said longitudinal fire barrier being cylindrical a-nd extending at least about 4 mm. and up to about 6 mrn. longitudinally of said tubular wrapper and around the entire periphery thereof, said tire barriers cooperating positively -to stop burning of said wrapper and said other column orf tobacco even during drawing therethrough when said other col'urnn of tobacco is substantially cons-urned.

8. A cigarette comprising a longitudinally extending tubular wrapper having a diameter of about 7.5 mm., two columns of tobacco .in end-to-end position within said wrapper, a lateral iire barrier of aluminum foil between the adjacent ends of said two columns of tobacco, and a longitudinal dire barnier of aluminum foil extending from said la-teral re barrier and in thenmal contact with said wrapper around the entire periphery thereof, said cigarette being adapted to be smoked from either end with one of said columns of tobacco serving as a filter for the Ismoke produced by the burning of the other column of tobacco, said lateral tire barrier having rfrom about 8 to about 10 holes therein spaced from the outer periphery thereof at least about l mm. with adjacent holes spacedapart at least about l mm. `from each other, said holes having a diameter in the range from about 0.225 mm. to about 0.275 nun. and havin-g an aggregate cross-sectional area from about 0.4 to about 0.5 mm?, said longitudinal fire barrier being cylindrical 'and extending at least about 4 mm. up to about `6 mm. longitudinally of said wrapper and around the entire periphery thereof, said fire barriers cooperating positively to stop burning the said Wrapper and said other column of tobacco even during drawing thereof when said other column of tobacco is substantially consumed.

9. A cigarette comprising a pair of longitudinally extending tubular wrappers, each of said wrappers having a column of tobacco therein, a lateral fire barrier of metal foil between the 'adjacent ends of said wrappers and said columns of tobacco, and a longitudinal fire barrier of Lmetal foil extending yfrom said latenal barrier exterior-aly of said wrappers and in thermal contact with at least one of said wrappers around the entire periphery thereof, said cigarette 4being adapted to be smoked from either end with one of said columns of tobacco serving as a filter for the smoke produced by the burning of the other column of tobacco, said lateral tire barrier being porous so as to present substantially no resistance to drawing therethrough during the smoking of said other column of tobacco, said longitudinal re barrier being cylindrical and extending at least about 4 mm. longitudinally of said wrappers and around the entire periphery thereof, said fire barriers cooperating positively to stop burning the said wrappers and said other column of tobacco even during drawing therethrough when said other column of tobacco is substantially consumed.

10. The cigarette set forth in claim 9, wherein said longitudinal fire barrier extends substantially equal distances from said lateral tire barrier and is in contact therewith and lwith both of said wrappers around the entire periphery thereof.

11. The cigarette set forth in claim 9, wherein said longitudinal -fire barrier extends in only one direction from said lateral fire barrier and surrounds the adjacent end of only one of said wrappers.

12. A cigarette comprising a pair of longitudinally extending tubular wrappers, each of said wrappers having a column of tobacco therein, a lateral `fire barrier of metal foil between the adjacent ends of said wrappers and said columns of tobacco, a longitudinal re barrier of metal foil extending from said lateral barrier exterioraly of said wrappers and in thermal Contact with at least one of said wrappers around the entire periphery thereof, and a tubular overwrap extending around said longitudinal re barrier and the adjacent ends of said Wrappers and seoured to said wrappers to hold said Wrappers and said columns of tobacco in operative position against said la-teral fire barrier, said cigarette being adapted to be smoked from either end with one of said columns of tobacco serving as a filter yfor the smoke produced by the burning of the other column of tobacco, said lateral fire barrier being porous so as t-o present substantially no resistance to drawing there-through during the smoking of said other column of tobacco, said longitudinal fire barrier being cylindrical and extending Iat least .about 4 mm. longitudinally of said wrappers and around the entire periphery there-of, said lire barrie-rs cooperating positively to stop burning the said wrappers and said other column of tobacco even during drawing therethrough when said other column of tobacco is substantially consumed.

13. The cigarette set forth in claim 12, wherein said longitudinal re barrier extends substantially equal distances from said lateral fire barrier `and is in contact therewith and with both of said wrappers around the entire periphery thereof.

14. The cigarette set -forth in claim 12, whe-rein said longitudinal fire barrier extends in only one direction from said lateral 're barrier yand surrounds adjacent end of only one of said wrappers.

15. In a cigarette comprising a longitudinally extending tubular wrapper, two columns of tobacco in end-toend position within said wrapper, a lat-eral fire barrier of metal foil between the `adjacent ends of said two columns of tobacco, and a longitudinal fire barrier of metal foil extending from said :lateral fire barrier and in thermal contact with said wrapper around the entire periphery thereof, said cigarette being `adapted to be smoked from either end 4with one of said columns of tobacco serving as a filter for the smoke Iproduced by the burning of the other column yof tobacco, said lateral fire barrier being porous so as to present substantially no resistance to drawing therethrough during the smoking of said other column of tobacco, said longitudinal lire barrier being cylindrical Iand surrounding said vlateral fire barrier and in contact therewith and engaging the inner surface of said wrapper and extending in both direotions from said lateral lire barrier a total distance of at least about 4 mm., said fire barriers cooperating positively to stop burning of s-aid wrapper and said other column of tobaceo even during drawing therethrough when said other column of tobacco is substantially consumed.

16. A cigarette comprising a longitudinally extending tubular wrapper, two columns of tobacco in end-toend position within said wrapper, a lateral fire barrier of metal foil between the ladjacent ends `of said two columns of tobacco, and `a longitudinal fire barrier of metal foil integra-l with the periphery of said laterial re barrier and extending therefrom and in thermal contact with said wrapper around the entire periphery thereof, said lateral fire lbarrier and said longitudinal re barrier cooperating to provide -a cup-shaped form occupied by the adjacent end of one of said columns of tobacco, said cigare-tte being ladapted to be smoked from either end with one of said columns of tobacco serving as a filter for the smoke produced by the burning of the other column of tobacco, said lateral re barrier being porous so as to present substantially no resistance to drawing therethrough during the smoking of said other column of tobacco, said longitudinal fire barrier extending from said lateral re barrier at least by 4 mrn. longitudinally of said wrapper and around the entire periphery thereof, said fire barriers cooperating posi-tively to stop bufrning of said wrapper and said other column of tobacco even during drawing therethrough when said other column to tobacco is substantially consumed.

17. A cigarette comprising a pair of longitudinally extending tubular wrappers, each of said wrappers having a column of tobacco therein, a lateral re barrier of metal foil between the adjacent ends of said wrappers and said columns of tobacco, fa longitudinal re barrier of metal foil integral with the periphery of said lateral fire barrier and extending therefrom exteriorally of the associated wrapper and in thermal contact therewith around the entire periphery thereof, said lateral fire barrier and said longitudinal fire barrier cooperating to provide ya cup-shaped pocket occupied by yone end of the associated column of tobacco, and Ia third wrapper extending around said longitudinal fire barrier and the adjacent ends of said pair of wrappers and secured thereto to hold the `adjacent ends thereof in yoperative relationship to said cup-shaped pockets, said cigarette being adapted to be smoked from either end with one of said columns of tobacco serving as a filter for the smoke produced by the burning of the other column of tobacco, said lateral re barrier being porous so yas to present substantially no resistance to drawing therethrough during the smoking of said other column of tobacco, said longitudinal fire barrier being cylindrical and 'extending at least a'bout 4 mim. longitudinally of said wrappers and around the entire periphery thereof, said fire barriers cooperating positively to stop burning of said wrappers and said other column of tobacco even during drawing therethrough when said other column of tobacco is substantially consumed.

18. A cigare-tte comprising a longitudinally extending tubular wrapper, two columns of tobacco in end-to-end position within said wrapper, a pair of spaced-apart lateral fire -barriers of m'etal foil between the adjacent ends of said two columns of tobacco, 1and a longitudinal lire barrier of metal foil extending between said lateral lire barriers and in thermal contact therewith and with said wrapper around the entire periphery thereof, said lateral lire barriers and said longitudinal fire barrier cooperating to provide a capsule containing therein a filter material, said cigarette being adapted to be smoked from either end with one of said columns of tobacco serving as a filter for the smoke produced by the burning of the other column of tobacco, -said l-aterial iire barriers being porous and said tilter material being porous so as to present substantially no resistance to drawing therethrough during the smoking of said other column of tobacco, said longitudinal lire barrier being cylindrical and at least extending about 4 mm. longitudinally of said wrappers and around the entire periphery thereof, said fire barriers cooperating positively to stop burning of said wrap-per and said other column of tobacco even during drawing therethrough when said other column of tobacco is substantially consumed.

19. The cigarette set forth in claim 18, wherein, said filter material is tobacco.

20. The cigarette set for-th in claim 18, wherein, said lter material is an adsorption resin for adsorbing certain constituents of the smoke produced during the burning `of said cigarette.

21. The cigarette set forth in claim 18, wherein said longitudinal lire wall is integral with said lateral fire barriers at the opposite ends thereof.

22. The cigarette set forth in claim 18, wherein, said longitudinal lire wall includes a pair of telescoping cylinders integral respectively at the outer ends thereof with said lateral lire barriers, and there further is provided within said capsule a porous partition walfl.

23. A cigarette comprising a lpair of longitudinally extending tubulair wrappers, each of said wrappers having a column of tobacco therein, a pair of spaced-apart lateral lire barriers of metal foil between the adjacent ends of s-aid wrappers land said columns of tobacco, a longitudinal lire barrier of metal foil extending between the said lateral tire barriers and in contact therewith around the peripheries thereof, said lateral tire barriers and said longitudin-al lire barrier. cooperating to provide. a capsule containing therein a filtering material, and a third wrapper extending around said longitudinal lire barrier and the adjacent ends of said pair of wrappers and secured thereto to hold the adjacent ends thereof in operative relationship to said capsule, said cigarette being adapted to be smoked from either end with one of said columns of tobacco serving las a filter for smoke produced by the burning of the other column of tobacco, said lateral tire barriers and said filtering material being porous so as to present substantially no resistance to drawing therethrough during the smoking of said other column Iof tobacco, said longitudinal lire barrier be* ing cylindrical and extending at least about 4 mm. longitudinally of said wrappers and around the entire periphery thereof, said fire barriers cooperating positively to stop burning of said wrappers and said other column of tobacco even during drawing therethrough when said other column of tobacco is substantially consumed.

References Cited by the Examiner UNITED STATES PATENTS 261,169 7/1882 Munson 131-11 1,798,537 3/1931 Honigbaum 131-4 2,389,104 11/1945 Baner elt al. 131-10 2,742,905 4/1956 Molins 131-61 2,830,594 4/1958 Policansky 131-61 2,998,819 9/1961 Snowden 131--10 3,064,657 11/1962 Shriner 131-10 FOREIGN PATENTS 608,407 1/ 1935 Germany.

760,772 11/ 1956 Great Britain.

142,429 11/ 1930 Switzerland.

240,987 6/ 1946 Switzerland.

SAMUEL KOREN, Primary Examiner.

MELVIN D. REIN, Examiner. 

1. A CIGARETTE COMPRISING A LONGITUDINALLY EXTENDING TUBULAR WRAPPER, TWO COLUMNS OF TOBACCO IN END-TO-END POSITION WITHIN SAID WRAPPER, A LATERAL FIRE BARRIER OF METAL FOIL BETWEEN THE ADJACENT ENDSOF SAID TWO COLUMNS OF TOBACCO, AND A LONGITUDINAL FIRE BARRIER AND IN THERMAL FOIL EXTENDING FROM SAID LATERAL FIRE BARRIER AND IN THERMAL CONTACT WITH SAID WRAPPER AROUND THE ENTIRE PERIPHERY THEREOF, SAID CIGARETTE BEING ADAPTED TO BE SMOKE FROM EITHER END WITH ONE OF SAID COLUMNS OF TOBACCO SERVING AS A FILTER FOR THE SMOKE PRODUCED BY THE BURNING OF THE OTHER COLUMN OF TOBACCO, SAID LATERIAL FIRE BARRIER BEING POROUS SO AS TO PRESENT SUBSTANTIALLY NO RESISTANCE TO DRAWING THERETHROUGH DURING THE SMOKING OF SAID OTHER 